Die for drawing and compressing tubes



(No Model.)

W. ALLDERDIOEL DIE FOR DRAWING AND COMPRESSING TUBES. No. 329,612. Patented Nov. 3, 1885..

ished, the size of opening e should be such as NITED STATES \VINSLOlV ALLDERDIOE, OF AKRON, OHIO.

DIE FOR DRAWING AND COMPRESSING 'T'UB ES.

SPECIFICATION forming part of Letters Patent No. 329,612, dated November 3, 1885.

Application filed June 3, 1885.

To all whom it may concern.-

Be it known that I, WINsLow ALLDERDIOE, a citizen of the United States, residing at Akron, Summit county, Ohio, have invented anew and useful Improvement in Dies for Drawing, Compressing, and Polishing Gold Metal Tubes,of which the following is a specification.

In the drawings forming a. part of this specification, Figure 1 represents the inner part, a, of the die, and a horizontal section of the outer part, b, and frame f. Fig. 2 is a vertical cross-section at line 1 in Fig. 1.

The die consists of an outer part, b, formed with an opening, 6, and an inner part, a, which is a rod formed with an enlargement or bulb, a, extending into opening e to form the interior sides of the tubes to be drawn. Part a may be of a single piece of steel; but I prefer to make it with the rod separate from the steel bulb a, which is preferably of a tapering curved form at each end, with the intermediate part cylindrical. The bulb and rod are screw-threaded, and after screwing the bulb on the rod it is fastened by a pin or rivet, s. It is not essential that the rear end of the bulb at the end of the rod should be curved, but it s'hould be tapering, in order that it may not be broken by the contraction of the interior sides of the tube 0 just as the latter passes over the bulb. The outer part, b, is formed with an opening, 6, which I prefer to make flaring at both ends, with the intermediate part cylindrical. The diameter of the tube to be drawn being slightly greater than the smallest diameter of opening 6, and the interior diameter of the tube being slightly less than the greatest diameter of bulb a, in drawing the tube it is compressed and polished both on its exterior and interior sides at the same time. If it be not desired to have the exterior of the tube compressed and polmerely to closely fit the tube,in order to resist the outer pressure of bulb a, and prevent expansion of the tube. The die is to be placed in a suitable frame, f, formed with an opening, 0, of sufficient size to admit the tube. A collar, 9, of the same diameter as opening 0, is placed on rod a in the opening to keep the rod in the center of opening 0, which is in line with the center of opening a in part 1).

Serial No. 167,458. (No model.)

Rod a is held at its front end by means of nut 01. and key h, the rod being slotted to receive the key. In drawing large tubes, nut 02 may be dispensed with and rod (0 held by the key only.

In operating the die one end of tube a should first be expanded to receive bulb a, and its exterior slightly shouldered, or otherwise suitably formed, to be held by jaws d d, or other suitable device for holding and drawing the tube. Rod (1- is then to be placed in the tube, and both together passed through openings 0 and e to the position shown in the drawings. Collar g and key h are then to be put in place, as shown, and jaws d d firmly pressed against the tube by means of clamp t and set-screw v. A plug, Z, is put in the end of the tube to resist the compression of the jaws. The tubes may be drawn by means of jaws d d, to be hinged to a draft-block traveling backward and forward on a rotary screwshaft, or by any other suitable and well-known means. Pneumatic tubes and hollow shafting may thus be formed with smooth and polished interiors and exteriors.

I claim as my invention 1. A die for drawing, compressing, and polishing cold metal tubes, consisting of an outer part formed with an opening to admit the tube, and an inner part arranged centrally in said opening to operate on the interior sides of the tube, the greatest diameter of said inner part being in the same plane with and less than the smallest diameter of said opening in the outer part, substantiallyas described.

2. A die for drawing, compressing, and polishing cold metal tubes, formed with an outer part havingjan opening,tapering at both ends within said opening, whose sides operate on the exterior of the tubes, in combination with an inner part consisting of a rod formed with an enlargement to operate on the interior sides of the tube, substantially as described, the greatest diameter of said opening being in the plane'with andless than the smallest diameter of said'opening.

3. A die for drawing, compressing, and polishing cold metal tubes, formed with an outer part having an opening to admit the tube, and an inner part consisting of a rod formed with an enlargement, the front ends of said opening and of said inner part being tapering in opposite directions at the entrance of the die, substantially as describedt 4. The rod a, formed with bulb a", in e0n1 bination with collar g, a suitable frame, f,

5 formed with an opening, 0, of sufficient size to admit the tube to be drawn,and part b, formed with opening 0, substantially asdescnibede.

5. The rod a, formed with bulb a, in combination with. key h,'a suitable frame,f,f0rmed with Opening 0, of sufficient size to admit the 10 tube to be drawn, and part 1), formed with opening e, substantially as described.

WINSLOW ALLDERDIOE. Witnesses:

FRED'BISHQR.

J. G. RAYMOND. 

